Schumann Resonance舒曼共振
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Siingh et al. (2006)
Titan
Cavity properties
• Ionosphere at 1,200 km, 63 km • h (s ~ 10-3 S m-1) = 750 km • Surface conductivity (s) = 10-10 S m-1 • Radius (Rp) = 2575 km • Skin depth (d) = 100 km
Simoes et al. (2008)
Frequencies on Titan
• Huygens (Jan 14, 2005) observed: 36 Hz ELF wave • Instrumentation noise most likely ruled out as source • Model results: 13.43 (19.15), 28.13 (34.32), 43.93
schumannresonance舒曼共振论文总结英语资料ppt文档免费阅读免费分享如需请下载
Schumann Resonance
from Earth
to Titan
Dana Ionita School of Earth & Atmospheric Sciences
Georgia Institute of Technology
Schumann waves
• Resonance waves of the atmospheric cavity formed between the Earth’s surface and ionosphere, two conductive surfaces with a non-conductive atmosphere
Simoes et al. ( & properties
• Surface conductivity (s) = 0.01 (land) and 1 (sea) S m-1 • Frequencies (obs) = 7.8, 14, 20, 26, 33, 39, 45 Hz (+/- 0.5 Hz daily) • Cavity height (h) = 100 km • Radius (Rp) = 6378 km • Skin depth (d) = 0 km • Energy source: lightning
Titan’s liquid ocean
• Titan is believed to have an underground liquid water layer
• Modeling of Titan cavity shape & size of cavity depth of underground liquid water surface
(49.48) Hz
Beghin et al (2007)
Energy source ???
• Lightning not observed, but not ruled out
• Titan ionosphere & motion of Saturn’s magnetosphere
Blanc et al (2002)
need to be better understood
• Depth of liquid ocean
• - the cavity properties can be relatively well constrained in a model
Thank you. Any Questions?
Sotin & Tobie (2008)
Further Work
2 questions about Schumann resonance at Titan:
• Energy source
• - faint lightning possible, not observed • - interactions with Saturn’s magnetosphere
Outline
Definition Earth • cavity dimensions & properties Titan (properties) • Huygens probe (observations) • cavity dimensions & properties (a bit more complex) • energy source: ??? possibilities • liquid ocean Conclusion: 2 big questions about Titan
Titan
Cavity properties
• Ionosphere at 1,200 km, 63 km • h (s ~ 10-3 S m-1) = 750 km • Surface conductivity (s) = 10-10 S m-1 • Radius (Rp) = 2575 km • Skin depth (d) = 100 km
Simoes et al. (2008)
Frequencies on Titan
• Huygens (Jan 14, 2005) observed: 36 Hz ELF wave • Instrumentation noise most likely ruled out as source • Model results: 13.43 (19.15), 28.13 (34.32), 43.93
schumannresonance舒曼共振论文总结英语资料ppt文档免费阅读免费分享如需请下载
Schumann Resonance
from Earth
to Titan
Dana Ionita School of Earth & Atmospheric Sciences
Georgia Institute of Technology
Schumann waves
• Resonance waves of the atmospheric cavity formed between the Earth’s surface and ionosphere, two conductive surfaces with a non-conductive atmosphere
Simoes et al. ( & properties
• Surface conductivity (s) = 0.01 (land) and 1 (sea) S m-1 • Frequencies (obs) = 7.8, 14, 20, 26, 33, 39, 45 Hz (+/- 0.5 Hz daily) • Cavity height (h) = 100 km • Radius (Rp) = 6378 km • Skin depth (d) = 0 km • Energy source: lightning
Titan’s liquid ocean
• Titan is believed to have an underground liquid water layer
• Modeling of Titan cavity shape & size of cavity depth of underground liquid water surface
(49.48) Hz
Beghin et al (2007)
Energy source ???
• Lightning not observed, but not ruled out
• Titan ionosphere & motion of Saturn’s magnetosphere
Blanc et al (2002)
need to be better understood
• Depth of liquid ocean
• - the cavity properties can be relatively well constrained in a model
Thank you. Any Questions?
Sotin & Tobie (2008)
Further Work
2 questions about Schumann resonance at Titan:
• Energy source
• - faint lightning possible, not observed • - interactions with Saturn’s magnetosphere
Outline
Definition Earth • cavity dimensions & properties Titan (properties) • Huygens probe (observations) • cavity dimensions & properties (a bit more complex) • energy source: ??? possibilities • liquid ocean Conclusion: 2 big questions about Titan